package org.lvhengchang.schoolmanager.servlet;

import java.io.IOException;


import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebFilter(filterName = "loginFilter", urlPatterns = {"/main/*", "/student/*", "/teacher/*"})
public class LoginFilterServlet implements Filter {
	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse resp = (HttpServletResponse)response;
		HttpSession session = req.getSession();
		if (session.getAttribute("login") == null) {
			resp.sendRedirect(req.getContextPath()+"/");
		}
		chain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
	}

}
